Valve-lifting device



H. EGLOFF.

VA'LVE LIFTING DEVICE.

APPLICATION FILED SEPT. 4. 1919.

FIE- J.

Patented July 26, 1921.

v UNITED STATES HERMALNN EGLOFF, OF LOS ANGELES, CALIFCIRNIA.

vALvE-mr'rme DEVICE.

Specificationof Letters Patent. Patented July 26', 1921.

Application filed September 4, 1919. Serial No. 321,698.

To all whom it may concern:

Be it known that I, HERMANN -EGL0FF, a citizen of Switzerland, residing at 2224; Ocean View Ave, Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Valve-Lifting Device, of which the following is a specification. 1

This invention relates to a valve lifting device, and has for an object the provision of means whereby upon movement of the valve lifter a certain distance, the valve head will be moved a proportionately greater distance. Advantage is taken of the fact that a short movement of any fulcrum lever will transmit a greater distance to the longest arm thereof.

In practicing this, invention I provide means placed intermediate an end of the valve stem and an end of the valve lifter, which means consists of lever arms arranged crosswise held and pivoted in an-independent frame member; a detached rectangular cap laced on the end of the 'tappetor valve ifter or plunger in" order that the downward intermediate projections of the levers will'not have any overhang; and a detached ooved counterbored rectangular plate, on the slotted orgrooved portion of which the ends of'the levers opposite their pivot points operate, and on which the end of the valve stem opposite the valved seats in the counterbore. i i i The invention has for an object the provision of an improved valve lifting device which will allow a gre'atervalve lift than hitherto','and which, will besuperior in point of relative simplicity andv inexpensiveness, taken in conjunctionwith utility, durability, general eflicency and serviceability.

With the above and other objects in view, P

the invention consists in the novel arrangementof parts utilized for lifting the valve, and in the formation, construction, combination, association, and inter-relation of the different members, all as disclosed in the accompanying drawing, described in the fol- IOWlIlg statement, and finally pointed out in claims. Y

In the drawing: 1 I

Figure 1 illustrates a fragmentary elevation of a valve on the side type utilizing the improved valve lifting device;

Fig. 2 is a fragmentary elevation similar to Fig. 1, but showing the valve lifting device in operatlon with the valve head unseated, the cam member having rotated 180 degrees from the showing in Fig. 1;

Fig. 3 is a fragmentary elevation showing a side view of Fig. 2.

Corresponding parts in all the figures are designated by the same reference characters.

Referring with particularity to the drawing, I have shown in the various figures certain standard parts which are now utilized in internal combustion engines for admitting a power giving fluid to the combustion chamber, or forallowing gas to escape from the combustion chamber of an engine.

In the drawing, A designates the valve of which 1 is a valvestem and 2 a valve lifter or plunger or tappet. As before mentioned the drawing shows a valve on the side type, but I donot wish to be understood as confining my invention to a valve of this type, inasmuch asthe .valve in the head type might as readily be utilized in my invention. I v

The valve stem is provided with a valve spring seat or washer 3 which seat is keyed as at 4:, or otherwise held, to a portion of the valve stem 1. A valve cage 5 has a valve stem guide .6 through which the valve stem extends. A topportion of the valve cage 5 is'provided with a valve seat 7, shown in dotted lines. Surrounding a portion of the valve stem guide 6 and coacting with a portion of the valve cage 5 as at 8 and with the valve seat 8, as at 9, is a helical springlO. It is ordinary practice in any valve to include a spring 10, as above described, and the spring is used to close a valve head 11 upon the valve seat 7 during certain rotation of the cam, to be described later. V

Opposite the valve head 11 is a transverse rectangular member .13. v This member is rovided with a counterbore 14 in which the end of the valve stem opposite the valve head seats. This member is provided with a longitudinal grooved portion 15.

The valvelifter or plunger or tappet 2 passes through a guide bushing 16. One end of the valve lifter 2 is provided with a disk 17 which cooperates with a cam member 18 rotating upon its shaft, 19. In this invention a means is provided be tween an end 20 of the valve lifter 2 and the. end 12, which means serves a proportionately greater upward movement to the valve than the movement of the valve lifter. The means comprises cross lever arms 22 and 23 so formed that one end of to transmit same is angularly directed and provided with boss portions 24 and 25. Means such as pins 26 and 27' pass through the'perforations in the boss portions 24 and 25'and engage with a frame member a.

The frame member is independent of the engine casing. The arms 22 and 23 are identical in formation, and a part as 28 on each of the arms is downwardly directed. The downwardly directed portion 28 really constitutes a projection formed intermediate an edge portion of the arms 22 and 23. The portion 28 is so arranged that it engages the end 20' of the valve lifter 2 as shown at 21. End portions 29 and 30 of the lever arms 22 and 23 slide within the groove 15' of the member 13.

It will thus be seen that the groove 15 acts as a guide for the ends 29 and 30 of each of the lever arms. As will be observed by referring to the figures the lever arms 22 and 23 are so joined to the frame member a that the pivoted portions, or rather the boss portions, straddle the end as at 21 of the valve lifter 2.

It is obvious that the frame member might be dispensed with, and bracket members secured to the guide bushing 16, which memberswould support the levers 22 and 23. This would simply be a matter of choice. In the ordinary gas engine, the valve stem will be lifted so that the valve head will be unseated a distance dependent upon the size of the cam member 18, minus of course the valve clearance, when the cam has rotated so as to lift the valve plunger its maximum upward distance.

.With this device I take advantage of the relative movement of the pivoted levers 22 and 23, and as the pivot levers are identically formed, a slight movement of the lever 'arms22 and 23 at some portion intermediate thereof, will lift the end portions as 29 and 30 a proportionately greater distance dependent upon the distance between the point of contact of the projections 28 on each of the lever arms and the ends'29 and 30.

The lever arms as arranged will act upon the member 13 so that any impulse or movement of the valve lifter 2 will be transmitted equally through the lever arms to the valve stem 1.

It is obvious that many minor changes and variations and modifications may be made in departure from the particular description and showing of the accompanying drawing, in adapting the invention to varying conditions and requirements of use and service, without departing from the true spirit of the invention.

Having thus disclosed my invention, I claim and desire to secure by Letters Patent:

1. A valve lifting device, the combination with a valve and valve lifter, of means whereby upon movement of the valve lifter the valve is raised to a degree in excess of the rise of the valve lifter; said means comprising crossed levers. V

2. In a valve lifting device, the combination with a valve and wvalve lifter, of means whereby upon movement of the valve lifter,

tion with a valve and valve lifter, of means whereby upon movement of the valve lifter, the valve stem is raised to a degree in excess of the rise of the valve lifter; said means comprising crossed levers, and said leversbeing provided with bossed portions pivotally mounted at opposite sides of said valve lifter; and a transverse member placed in position intermediate an end of the valve stem and ends of the crossed levers opposite the pivoted bossed portions.

'4. In a valve lifting device, the combination with a valve and valvelifter, of means whereby upon movement of the valve lifter, the valve stem is raised to a degree :in excess of the rise of the valve lifter; said means comprising crossed levers, and said levers being provided with bossed portions pivotally mounted at opposite sides of said valve lifter, and a transverse member placed in positionintermediate an end of the valve stem and ends of the crossed levers opposite the pivoted bossed portions; said transverse member being provided with a longitudinal groove within which play theends of said levers. i

5. In a valve lifting device, the combination with a valve and valve lifter, of means whereby upon movement of the valve lifter, the valve stem is raised to a degree in excess of the rise of the valve lifter; said means comprising crossed levers, and said levers being provided with bossed portions pivotally mounted at opposite sides of said valve lifter, and a transverse member placed in position intermediate an end of the valve stem and ends of the crossed levers opposite the pivoted bossed portions; said transverse member being provided with a longitudinal groove within which play the ends of said levers; said transverse member likewise being formed with a counterbore with in which Seats the end of valve stein V which is opposite its valve head.

' HERMANN EGLOFF. 

